JPS606501B2 - Base paper for diazo-sensitive paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a base paper for diazo-sensitive paper which has improved imageability.

In particular, it relates to a base paper for diazo-sensitive paper that has improved photosensitivity, partial penetration, and contrast. Diazo-sensitive paper usually has a subbing layer of colloidal silica containing a binder on the surface of the base paper, a diazonium salt, a coupler,
It is made by coating a photosensitive layer containing stabilizers, etc.

Alternatively, the undercoat layer and photosensitive layer may be formed by applying only a photosensitive liquid. The image suitability of the diazo photosensitive paper is such that it is desirable that the image produced by superimposing it on a transparent or translucent paper or film-based document, exposing it to light, and developing it is as clear as possible.

In other words, the darker the color development is for the image part of the document, the better, and the better for the white part to be uniformly plain without any local density unevenness. The density of this image area is also affected by the type and amount of diazonium salt, but if a specific diazonium salt is used and the same amount is applied, it will form a uniform layer on the surface. desirable.

In addition, for white background areas, if the thickness of the diazonium salt layer is partially uneven, or if there are areas where some diazonium salt has soaked into the base paper layer, the diazonium salt will decompose depending on the amount of exposure. There is a difference in the properties of the diazonium salt, and the areas containing a lot of diazonium salt, especially the areas that have soaked into the base paper layer, remain undecomposed and develop color when developed. These deteriorate the quality of the diazo-sensitive paper, such as a decrease in contrast and a decrease in photosensitivity. In addition, colloidal silica liquid and diazo photosensitive liquid applied to base paper are usually
Since it is very acidic and has a low surface tension, a strong size is required for the base paper. Furthermore, in addition to normal sizing properties for water, it is also required to have properties that prevent the penetration of special substances such as ethylene glycol, polyethylene glycol, glycerin, and various alcohols. On the other hand, if it becomes too water-based, it will cause uneven adhesion of the subbing layer and photosensitive layer, which is not preferable. In order to solve these problems, we have to worry about the types of internal sizing agents and/or surface sizing agents and how to use them, but as a result of intensive research on these points, we have found that paper containing organic fluoro compounds It was confirmed that it is extremely effective.

In the present invention, "contained" means that an organic fluoro compound is added to the paper layer by internal addition or impregnation, or added to both sides or one side in a surface processing step.

One object of the present invention is to provide a diazo-sensitive paper base having good diazo image suitability.

Here, diazo image suitability refers to suitability for normal diazo photosensitive paper, such as sensitivity, density, contrast, density unevenness, development speed, color development, storage stability, and fading resistance.Another purpose is the diazo photosensitive liquid coating process. In this case, uneven adhesion of the coating solution.
An object of the present invention is to provide a diazo-sensitized base paper that has little staining and can be coated uniformly on the surface.

Yet another object is to provide a base paper for diazo-sensitive paper that absorbs less developer in green development and thus exhibits less deterioration in storage stability due to excessive absorption of alkali and other chemicals in the developer.

These objectives are achieved by incorporating organic fluoro compounds into the diazo-sensitive paper base paper. The organic fluoro compound used in the present invention is characterized in that it has a group in which three or more fluorine atoms and at least three carbon atoms are bonded in the molecule.

Particularly useful are compounds having in the molecule an aliphatic hydrocarbon group, particularly a group in which some or all of the hydrogen atoms of an alkyl group are replaced with fluorine atoms. Further, in order to facilitate introduction in the base paper manufacturing process, it is desirable to introduce a group that imparts appropriate hydrophilicity to this compound. Such a hydrophilicity-imparting group.

Examples include carboxylic acid, sulfonic acid, sulfuric acid, phosphoric acid or their salts, hydroxy group, oxyalkylene group,
There are anionic groups such as onium group and gester group, cationic groups, nonionic groups, betaine groups, and N-oxide groups. Particularly preferred are compounds selected from mono- or diester salts of sulfuric acid or phosphoric acid having a perfluoroalkyl group having 3 to 18 carbon atoms. Alternatively, the organic fluoro compound may be emulsified with a suitable emulsifier and introduced during the base paper manufacturing process.

Of course, in the present invention, two or more organic fluoro compounds may be used in combination.

Typical examples are shown below.

'1) CF3 (CF2)91COONH4{2)'3
' ■ CF3 (CF2),. -CH2○-S03-Na
{5}(6} {7) {8} CF3(CF2)12-COO-(CH2CH
20) Fox day {9} (10) (11) (12) (13) (1 heart (15) (i6) (17) (18) Compounds used in the present invention are described, for example, in U.S. Pat.
No. 9,751, No. 2,567,011, No. 2,806
, No. 866 "No. 2,809,998, No. 2,915
, No. 376, No. 2,915,528, No. 2,934,
No. 45, No. 2,937,098, No. 2,957,0
No. 31, No. 3,472,894, No. 3,555,08
No. 9, Special Publication No. 45-37304, No. 52-16073
It can be synthesized according to the method described in Japanese Patent No. 52-39291, Tokusekki No. 47-9613, etc.

Some of the compounds are manufactured by Sumitomo Chemical under the trade name Sumiraze Resin (for example, FP-110), and from Minnesota Mining and Manufacturing Co. (hereinafter referred to as Company 3) under the trade name FC (for example, FC-110). 128FC
-134FC-170, FC-176, FC-430,
FC-232, FC-805, FC-806 FC-
807, FC-808, FC-824, FC-826,
FC-829 etc.), E. 1. DuPonbo ± to Z
ony] product name (for example, Zonyl-SI3~Z
The organic compounds used in the present invention are commercially available from Asahi Glass Co., Ltd. under the trade name Asahi Guard (for example, AO-530, AG-533) and from Dainippon Ink and Chemicals under the trade name Megafac. When the fluoro compound is applied in a very small amount (usually 1% or less in terms of solid content) based on the weight of the paper, an improvement in suitability for diazo images is observed.

Although it is difficult to limit the upper limit of the amount applied, it is meaningless to use more than necessary from the viewpoint of effectiveness and economy. For the purpose of the present invention, it is useful to apply the organic fluoro compound in a solid content of 0.001 to 1.0%, particularly preferably in a solid content of about 0.005 to 0.5% based on the paper weight. be.

In the present invention, methods for adding an organic fluoro compound to base paper include (1) a method of directly adding it to pulp slurry and making paper by a conventional method, (2) a surface treatment process using a papermaking process or an off-machine (e.g., size press, tab size, calender). Size "Gate roll coater, air knife coater, Sufu.

There is a method of applying it to the surface of paper on which a normal internal size is applied using a dye or the like. Of course, it may be used in combination with natural or synthetic polymeric substances such as starch, polyvinyl alcohol, and hydroxymethyl cellulose, which are commonly used as surface treatment agents.

It is also possible to add an organic fluoro compound by an internal addition method and then further apply the organic fluoro compound in the surface treatment process. Adding an organic fluoro compound to paper through a surface treatment process is more advantageous in terms of retention on the surface layer, cost, etc.Examples of the present invention are shown below, but the invention is of course limited to these. It is not something that will be done.

Example 1 Parts by weight of pulp LBKP 8
NBKP 20 is Scotchinoin FC807 0.1″ (organic fluoro compound manufactured by 3M) Acorbel 360XC
O. 3. Kaimen 557 (alkyl ketene dimer sizing agent manufactured by Dick Hercules)
0. Part by weight (polyamide polyamine epichlorohydrin fixing agent manufactured by Dick Hercules)
Using the above formulation, 79 sheets of paper was made using a normal papermaking process, and a 3% oxidized starch solution was size pressed to obtain a base paper for diazo photosensitive paper.

For comparison, the same formulation as above was made except that Scotchban FC807 (an organic fluoro compound manufactured by M Company) was not added, and a 3% oxidized starch solution was size pressed.

Add colloidal silica to these base papers at a solid content of 0.2 yen/
Diazo photosensitive paper was made by applying the diazo photosensitive liquid under the same conditions*.

When these were tested for suitability to diazo photosensitive paper, the results shown in Table 1 were obtained.

Table 1 *1 Indicates that the sensitivity speed is 15% faster than the comparison.

*2 Concentration due to light with a wavelength of 58 m.

From this test result, it was found that the suitability of diazo-sensitive paper was significantly improved by internally adding an organic fluoro compound.

Example 2 Aqueous solutions with varying concentrations of Asahiga W-do AG530 (organic fluoro compound manufactured by Asahi Glass Co., Ltd.) were prepared and applied to the paper surface using the size press device of a paper machine to vary the amount of organic fluoro compound applied. We made base paper for diazo photosensitive paper.

These base papers are coated with colloidal silica t diazonium salt.
When a diazo photosensitive liquid containing a coupler, a stabilizer, etc. was applied and the suitability of the diazo photosensitive paper was examined, the results shown in Table 2 were obtained. table
2. Percentage (solid content) based on the weight of 1 rice paper From these results, it can be seen that by applying a liquid containing an organic fluoro compound to the paper surface as a normal size press liquid, the maximum concentration is reduced to the extent that it does not cause any practical problems. ``It was confirmed that other diazo-sensitive papers with extremely excellent suitability could be obtained.

Example 3 An aqueous solution consisting of 1.0% polyvinyl alcohol 0.2% violet resin FPII0 (manufactured by Sumitomo Chemical Co., Ltd., organic fluoro compound) was applied to the front side of paper using an air knife coater until the amount of the organic fluoro compound adhered to the solid content. 0 at
．． I applied it to give it a strength of 03.

As a comparison, a paper coated with only polyvinyl alcohol was prepared, and a diazo photosensitive liquid was coated on both in the same manner as in Example 1 to test the suitability of the diazo photosensitive paper. The results were as shown in Table 3. Table 3 From these results, the effect of the organic fluoro compound was fully recognized.

Example 4 Aqueous solutions of Scotchban FC807 (manufactured by $M Company, organic fluoro compound) with varying concentrations from 0.01 to 1.0% were prepared and coated with a roll coater on the front side of paper with a basis weight of 58 cm. It was applied as a liquid at a rate of 10%.

A subbing layer of colloidal silica and a diazo photosensitive liquid were coated on the processed surfaces of the filter papers having different coating amounts of organic fluoro compounds prepared in this manner, and the following results were obtained. Table 4 Coating amount (solid content) per weight K of rice paper The results showed that the effect of adding the organic fluoro compound to the base paper not coated with the organic fluoro compound was sufficiently recognized.

Claims (1)

[Claims] 1 The organic fluoro compound is 0% solid content based on paper weight.
．． A base paper for diazo-sensitive paper, characterized in that it contains 0.001 to 1.0% by weight.